Eichard smith



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R. SMITH.

MIXING APPARATUS.

No. 449,259. Patented Mar. 31, 1891.

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RICHARD SMITH, OF SHERBROOKE, CANADA.

MIXING APPARATUS.

SPECIFICATIN forming part of Letters Patent No. 449,259, dated March 31, 1891.

Application tiled May 26,1890. Serial No. 353.226. (No model.)

To all whom t may concern:

Be it known that I, RICHARD SMITH, a citizen of the Dominion of Canada, residing at Sherbrooke, in the county of Sherbrooke and Province of Quebec, have invented certain new and useful Improvements in Mixing Apparatus; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to iigures of reference marked thereon, which form aV part of this specification.

This invention relates to apparatus for mixing or stirring either liquids or substances in a semi-liquid condition.

My invention is embodied in the peculiar relation an d structural arrangementof the several elements, which together form the apparatus.

The preferred use of the apparatus is for stirring and mixing the stock ot paper-pulp and the Water which is introduced into the same receptacle; but of course it may be applied to many other substances and compositions.

The drawings herewith presented represent in Figure l a sectional elevation vertically through a mixing apparatus containing my improvements. Fig. 2 is a plan of the same reduced.

The construction of this machine is intended to be such as to combine a central feed with a circumferential discharge in order to create a thoroughmixingof the matterpassing through the apparatus and in process of being mixed.

In the drawings I have represented a stationary circular vessel or receptacle l saucershaped or with Haring sides, which terminate in an upright rim. This receptacle is to be bolted or otherwise firmly fastened within the vator reservoir where it is to be employed. Further, a number of apertures 2 2 are cut at or near its bottom, which serve as inlet-openings to allow the liquid or semi-liquid matter in process of being mixed to enter the machine centrally at the bot-tom and by the relation of the several active parts to be lifted and discharged at the circumference to create a motion like boiling, aud in this way thoroughly commingle the constituents of said liquid. Centrally of said receptacle is stepped likewise nare, and the general cross-section corresponds with that of the fixed receptacle by which it is inclosed, but ot smaller dimensions, leaving an annular passage 5 between the walls of said parts. Vithin this passage are located two helical blades or lifters 6, which are secured exteriorly to and revolve with the stirrer. The width of these blades is slightly less than that of the space between the fixed and revolving parts ot' the apparatus, and said blades wind spirally upward to the upper edge or rim of the latter, which at this point is vertical or upright. The bottom of the stirrer has several apertures or openings 8 8, by means of which the liquid contents can readily pass upward and enter interiorly of the stirrer from the receptacle l, when they are influenced by the rotary motion of said stirrer and are forced upward, being discharged circumferentially from the interior of said stirrer.

It Will be noticed that the stirrer is an open vessel. Moreover, since the vessel l and the stirrer 4 communicate by means of the apertures 8 the liquid circulation is as follows: The currents are three-a downward current exteriorly of the apparatus toward the openings 2 and a circumferential discharge created bythe helical blades from the bottom upwardly through the passage 5, existing between the stationary receptacle and the rotary stirrer, while a second discharge occurs along the inside surface or" said stirrer, and is created' by the centrifugal eifects of the liquid contents in contact therewith. As a consequence of these upward currents within the apparatus, the downward iiow exteriorly of the same is directed inwardly toward the center, where it enters the apertures 2 and at once rises to be discharged circumferentially to create a boiling action, as shown and described.

IOO

The apparatus will operate as described without the blades.

lVhat I claim isl. A mixing apparatus composed of a stationary recep taele or outwardly-Haring circular vessel with inlet-apertures at the bottom, a revoluble shaft centrally th ereot, and a stirrer secured thereto similar in cross-section to that of the inclosing Vessel, and the inletopenings connecting With the bottom of the fixed receptacle to create two currents, one within the stirrer, the other exteriorly of said stirrerand between the latter and the receptacle, substantially as herein set forth.

2. The combination, with a stationary saucer-shaped circular casing, its inlet-openin gs, and a similarly-shaped rotary stirrer furnished With feed-openings at the bottom,

which connect with the casing, of the liftingblades exterior'ly of the' rotary stirrer, substantially as described.

3. The stationary daring Vessel, its bottom inlet-openings, a rotary shaft, and the revolving stirrer with diaring Sides and bottom openings, combined with the helical blades exteriorly upon said stirrer, the edges of the blades bei-ng adjacent, but non-contiguous to the 1nclosing walls of the stationary vessel, substantially as specified.

In testimonywhereof I affix my signatu re in presence of two witnesses.

RICHARD SMITH.

Witnesses:

H. E. LQDGE, E. K. BoYNToN. 

